Vitamins & minerals
Vitamin B1 (Thiamine)
Names you may see: thiamin thiamine B1 benfotiamine
The quick take
Thiamine helps the body use energy from food and supports normal cell function.
A closer look
What forms will I see on a label?
Common forms include thiamine hydrochloride and thiamine mononitrate. Some supplements use benfotiamine.
Why people use it
People use B1 supplements to meet thiamine needs and support normal energy metabolism. It is also included in B-complex products associated with daily energy support.
These are common goals and marketing uses. The evidence section below explains what research supports.
What does the evidence tell us?
Correcting inadequate intake is different from expecting an energy boost when needs are already met.
What should I know before using it?
Some medicines can affect thiamine status. Persistent fatigue or neurological symptoms need assessment rather than self-treatment.
Sources & further reading
NIH Office of Dietary Supplements ↗
Content reviewed: September 30, 2026
General educational information. Follow the product label and seek individual advice when needed.